Exercise arm unit for an exercise machine



FIG. 1 is a front perspective view of an exercise arm unit for an exercise machine showing our new design;

FIG. 2 is a top plan view thereof; and,

FIG. 3 is a rear view thereof.

The broken line portions of the disclosure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an exercise arm unit for an exercise machine, as shown. 